[PATCH v1] perf map: Fix map reference count issues

From: Ian Rogers
Date: Thu Feb 29 2024 - 01:21:13 EST


The find will get the map, ensure puts are done on all paths.

Signed-off-by: Ian Rogers <irogers@xxxxxxxxxx>
---
tools/perf/util/maps.c | 14 +++++++-------
tools/perf/util/probe-event.c | 4 +---
2 files changed, 8 insertions(+), 10 deletions(-)

diff --git a/tools/perf/util/maps.c b/tools/perf/util/maps.c
index 53aea6d2ef93..ce13145a9f8e 100644
--- a/tools/perf/util/maps.c
+++ b/tools/perf/util/maps.c
@@ -611,14 +611,14 @@ struct symbol *maps__find_symbol(struct maps *maps, u64 addr, struct map **mapp)
struct symbol *result = NULL;

/* Ensure map is loaded before using map->map_ip */
- if (map != NULL && map__load(map) >= 0) {
- if (mapp)
- *mapp = map;
-
+ if (map != NULL && map__load(map) >= 0)
result = map__find_symbol(map, map__map_ip(map, addr));
- if (!mapp)
- map__put(map);
- }
+
+ if (mapp)
+ *mapp = map;
+ else
+ map__put(map);
+
return result;
}

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index be71abe8b9b0..2a0ad9ecf0a2 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -2274,9 +2274,7 @@ static int find_perf_probe_point_from_map(struct probe_trace_point *tp,
ret = pp->function ? 0 : -ENOMEM;

out:
- if (map && !is_kprobe) {
- map__put(map);
- }
+ map__put(map);

return ret;
}
--
2.44.0.278.ge034bb2e1d-goog